US4817677A - Method for controlling the warp let-off and cloth take-up on weaving machines - Google Patents

Method for controlling the warp let-off and cloth take-up on weaving machines Download PDF

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Publication number
US4817677A
US4817677A US07/087,824 US8782487A US4817677A US 4817677 A US4817677 A US 4817677A US 8782487 A US8782487 A US 8782487A US 4817677 A US4817677 A US 4817677A
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Prior art keywords
signals
signal
generated
warp thread
warp
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US07/087,824
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Filip Deconinck
Johan Cappelaere
Michel Vandeweghe
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Picanol NV
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Picanol NV
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/06—Warp let-off mechanisms

Definitions

  • This invention concerns a method for controlling the warp let-off and cloth take-up motions on weaving machines, and in particular a method of processing the associated control signals so that they are not affected by the weaving pattern.
  • the speed of the cloth take-up is directly determined from the speed of the main drive motor.
  • the object of this invention is to provide a method for systematically avoiding these disadvantages.
  • the method used in this invention primarily consists of: detecting the variation with respect to time of one or more of the operative parameters which are functionally related to the warp tension and/or warp speed; taking the signal thus obtained and removing those components of the signal which are due to variations in the weaving pattern and; using the resulting clean signal to control the warp let-off and/or cloth take-up.
  • FIG. 1 is a schematic representation of the weaving process
  • FIGS. 2 and 3 represent the filter functions obtained in one embodiment of the invention
  • FIG. 4 is the control diagram for another embodiment
  • FIG. 5 represents the integration periods used for the embodiment of FIG. 4;
  • FIG. 6 is the control diagram for yet another embodiment
  • FIG. 7 represents the method of integration over time for the control diagram shown in FIG. 6;
  • FIG. 8 shows yet another possible control diagram
  • FIG. 9 shows the time sequence of the integration periods over which the integrations for the control diagram in FIG. 8 are carried out.
  • FIGS. 10 to 13 illustrate the startup sequence after a machine stop, for the control diagram shown in FIG. 8.
  • FIG. 1 is a schematic representation of the most important components involved in the weaving process, i.e., the warp beam 1, the warp threads 2, the warp tensioner 3, the shed 4, the frames 5, the reed 6, the cloth or textile 7, the cloth or textile take-up 8 with the breast beam 8A and the cloth beam 8B, and the weaving machine main drive motor 9.
  • the warp let-off is controlled by a control unit 10, using the tension in the warp threads and/or the speed of the weaving machine 2 to adjust the amount of warp let-off.
  • the warp tension can be determined in a conventional manner, for example by detecting the displacement of the warp tensioner 3 as it presses in towards the elastic restraint 11, while the weaving machine speed can be measured directly on the main drive motor 9.
  • One or both of the detected signals representative of the warp tension are then fed via the appropriate regulator (12A or 12B respectively) to e.g., control unit 10.
  • Control unit 10 then supplies a signal to controller 13A, which controls warp let-off motor 14A. This signal is a function of the detected warp tension and machine speed.
  • Motor 14A is coupled to warp beam 1 by an appropriate transmission 15A.
  • a signal from control unit 10 is supplied to controller 13B of a cloth take-up motor 14B; however in this case the signal should preferably be a function of the detected machine speed only.
  • Controllers 13A and 13B should preferably be frequency controllers.
  • the warp tension and machine speed detectors are indicated in a general manner only, by 16A and 16B respectively.
  • 16B can be a tachogenerator; or it can be a current meter which measures the current supplied to the motor, as this is representative of the motor speed.
  • the predetermined effects of variations in warp tension and machine speed due to the weave pattern are suppressed by taking the signal representing the warp tension or machine speed and filtering out all disturbance components from the signal with a frequency equal to the predetermined frequency of the variations caused by the weave pattern or a multiple thereof.
  • This can be done by means of suitable regulators 12A and 12B, each comprising an electric filter that selectively reduces the predetermined frequency of the disturbance components due solely to the variations in warp tension and machine speed resulting from the particular weave pattern of the cloth.
  • suitable regulators 12A and 12B each comprising an electric filter that selectively reduces the predetermined frequency of the disturbance components due solely to the variations in warp tension and machine speed resulting from the particular weave pattern of the cloth.
  • the use of electric filters to enhance or reduce specific frequency components of a signal is known and is not further explained here.
  • the resulting filtered signal is composed of frequency components representing the variations in warp tension and/or machine speed due to factors other than the particular weave pattern.
  • the signal is then passed in the conventional manner to controllers 13A and 13B of motors 14A and 14B.
  • Controllers 13A and 13B can of course be of any type, for instance frequency controllers if the motors are frequency-regulated.
  • the process just described is illustrated by the frequency characteristic shown in FIG. 2.
  • the filtered signal is then sent to control unit 10, in order to command frequency controllers 13A and 13B of motors 14A and 14B.
  • the signal components with a frequency greater than the frequency of the machine F(m) are eliminated by using a low pass filter as shown in FIG. 2.
  • the low pass filter filters out the high frequency components and allows the passage of only signal frequency components below the machine frequency to the controller 13A and 13B.
  • the lower frequencies are amplified more than the higher frequencies, while the highest frequencies are attenuated so as to eliminate them completely, as shown in FIG. 3. Since the lower frequencies play a greater role in determining the appearance of the cloth, this embodiment has a favorable effect on the end result.
  • FIG. 4 The control diagram for one possible embodiment is shown in FIG. 4. This embodiment uses a tension meter or detector 16A, a number of integrators (17-20), a control unit 21, a trigger 22 consisting of a cam 23 mounted on a shaft 24 (gauged to the machine speed) and a proximity switch 25, and control unit 10. Integrators 17 to 20 and control unit 21 correspond to regulator 12A used in the previous embodiments.
  • the operating process used to eliminate the warp tension variations caused by the weave pattern is illustrated in FIG. 5.
  • the tension meter or detector 16A continuously measures the tension in the warp threads 2, and passes this value to integrators 17-20, which are switched on and off by trigger 22 and control unit 21.
  • Integrator 17 is activated at time T1 and integrates the measured warp tension over a particular time period A.
  • integrators 18, 19 and 20 are activated at times T2, T3 and T4 and integrate the warp tension over time periods B, C and D respectively.
  • each of the time periods A, B, C and D is equal to the time period T necessary to form one complete weave pattern, or a multiple thereof, while times T1 to T4 are chosen so that all of the time periods A to D overlap each other.
  • the variation of the mean warp thread tension can be calculated from the known weave pattern.
  • the integral of the measured warp tension variations obtained by the integrators is compared with the integral of the theoretically determined warp tension variations for the particular time period A, B, C or D.
  • the warp let-off is controlled as a function of the difference in the two integrals.
  • the integration results generated by integrators 17 to 20 at the end of periods A to D are representative of the tension in the warp threads 2, but without being influenced by the variations in warp tension caused by the weave pattern. Due to the fact that the periods A to D overlap, it is not necessary to wait until a period T has elapsed before being able to supply a measurement result to control unit 21 of warp let-off drive 25.
  • Trigger 22 and control unit 21 should preferably control integrators 17 to 20 in such a way that time T1 coincides with the beginning of a new weave pattern, while the subsequent times at which integrators 18 to 20 are activated are evenly distributed over the time interval T. Times T1, T2 etc. should also preferably be chosen so that they coincide with successive starts of the weaving cycles. Since the integrations are carried out over a period equal to the period necessary for forming one complete weave pattern, the integrators can be activated at any desired angular position of the weaving machine.
  • FIG. 7 Since the weave pattern is known beforehand, the variation of tension with time can be calculated for particular time intervals, e.g., in this case for the time intervals T1 to T2, T2 to T3, etc. The four values obtained are entered in comparators 28 to 31. The tension in the warp threads 2 is then integrated separately for each of the periods E to H and then E' to H', etc. shown in FIG. 7. Then, according to the control diagram shown in FIG. 6:
  • the warp let-off is controlled as a function of the difference between the two integral values.
  • the method of the invention also fits the process just described.
  • the duration of the integration intervals E, F, G and H should correspond to the duration of successive weaving cycles.
  • the embodiment shown in FIG. 8 also uses an integrator 26. After this integrator 26 there is a series 32 of adders, I, II, III and IV, which one after the other send signals to control unit 21.
  • Integrator 26 operates in turn over the partial periods I, J, K, L, I', J', K' and L' which form identical sequences 33, each with a total duration equal to the period T necessary to form one or more complete weave patterns.
  • the integration result W over the partial period I is supplied to the memory of adder I;
  • the integration result X over the partial period J is supplied to the memories of adders I and II;
  • the corresponding result Y is supplied to I, II and III;
  • the result Z is supplied to the memories of all four adders.
  • the memory of adder I contains the total value W+X+Y+Z, which corresponds to the integration of the warp tension over the immediately preceding period with duration equal to time T.
  • This total value is therefore representative of the variations in tension of the warp threads 2, but without taking into account the variations in tension due to the weave pattern.
  • the total value W+X+Y+Z is equal to the integration result obtained over the integration period A in FIG. 5.
  • the total value thus obtained is sent by adder I to control unit 21 in order to regulate the warp drive motor, and the adder is then reset at zero.
  • the value W' is added to the memory of all the adders.
  • the memory of adder II contains the total value X+Y+Z+W', which is similarly passed to control unit 21.
  • the operating process can then continue in the same way, with the total value in each memory being sent to control unit 21 as soon as it is equivalent to an integration of the warp tension for the period just past with duration equal to the duration of the above mentioned series 33, i.e., period T.
  • FIGS. 10 to 13 One method of doing this for the embodiment of FIG. 8 is shown schematically in FIGS. 10 to 13.
  • control is carried out on the basis of values still present in memory from the previous measurement.
  • value W arrives at integrator 26, it is multiplied by 4.0 and added to the memory of adder I; also it is multiplied by 2.0 and added to the memory of adder II, multiplied by 1.5 and added to the memory of adder III, and finally multiplied by 1.0 and added to the memory of adder IV (FIG. 10).
  • adder II The value 4W from adder I is then supplied to control unit 21.
  • adder I is reset to zero.
  • the value X is taken from integrator 26 and placed in the memory of adder I; also it is multiplied by 2.0 and added to the memory of adder II, multiplied by 1.5 and added to the memory of added III, and finally it is multiplied by 1.0 and added to the memory of adder IV (FIG. 11).
  • the value stored in adder II is sent to control unit 21 in order to control the warp let-off drive.
  • adder II Shortly thereafter, at the latest during partial period K, adder II is reset at zero.
  • the signals 34 can also be sent to control unit 21, for example, after a machine stop, in order to instruct control unit 21 to follow the special start procedure.
  • this time described with reference to measurement of the machine speed the time necessary to form one complete weave pattern is measured, for example using a wheel with 36 teeth which rotates at the same speed as the main drive motor.
  • a weave pattern for which four machine cycles are necessary will correspond to 144 teeth.
  • the teeth are detected by a fixed detector. Each time one of the teeth passes the detector, a clock is started; it is reset at zero when 144 teeth have passed, thus measuring the time necessary for one complete weave pattern.
  • This value is representative of the machine speed, but independent of the weave pattern, as required for the invention.
  • This method yields 36 representative values for the machine speed. Obviously, a special startup procedure will have to be used when starting up the weaving machine.
  • the method of the invention can also be applied by taking the average of the above mentioned intervals, in order to obtain representative values for these intervals.
  • the machine can then be controlled in the normal way, by means of control unit 10.
  • the machine should be controlled as follows: the motor speed is governed at a value K multiplied by the filtered signal, where the value of K varies according to the weaving process. Where there are large variations in tension, the value of K can be automatically increased or reduced in order to achieve faster correction.
  • the value of K can also be a function of the beam diameter or the interweaving, or can change suddenly when there is a transition from one type of textile to another, for example, a change to a different weave with a corresponding change in the period necessary to form the weave pattern.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US07/087,824 1986-08-22 1987-08-21 Method for controlling the warp let-off and cloth take-up on weaving machines Expired - Lifetime US4817677A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2/61037A BE905314A (nl) 1986-08-22 1986-08-22 Werkwijze voor de sturing van de kettingaflaat en de doekopwikkeling bij weefmachines.
BEPV2/61037 1986-08-22

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942908A (en) * 1988-03-29 1990-07-24 Nissan Motor Co., Ltd. Warp transfer control system of loom for filling density change
US5024253A (en) * 1988-12-28 1991-06-18 Kabushiki Kaisha Toyota Chuo Kenkyusho System for controlling warp take up and let off rates
US5029616A (en) * 1989-02-06 1991-07-09 Picanol N.V. Controlling warp tension as a function of weaving pattern
WO1993025743A1 (en) * 1992-06-10 1993-12-23 Älmhults Bruk AB Device in a weaving machine
DE4325038A1 (de) * 1992-08-18 1994-02-24 Regatron Ag Steinach Regeleinrichtung für den Vorschub von Wickelgut einer Webmaschine
US5386855A (en) * 1992-10-23 1995-02-07 Nuovopignone-Industrie Meccaniche E Fonderia Spa Device for automatically varying the position of the shed vertex in a loom
US5487413A (en) * 1993-06-02 1996-01-30 Kabushiki Kaisha Ishikawa Seisakusho, Ltd. Method for restarting the operation of an air jet loom, after defective weft removal
US5827975A (en) * 1996-02-05 1998-10-27 Sulzer Rueti Ag Method and apparatus for measuring the tension of the warp in a weaving machine
US20020195160A1 (en) * 2001-06-26 2002-12-26 Sulzer Textil Ag Method and apparatus for the regulation of the warp let-off a weaving machine
WO2009128659A3 (ko) * 2008-04-16 2010-01-14 Sho Jinsoo 실공급방법, 경사공급방법, 실공급장치 및 직조방법
US20110000576A1 (en) * 2007-09-05 2011-01-06 Toshiba Kikai Kabushiki Kaisha Loom and drive device of loom
CN102605518A (zh) * 2011-01-21 2012-07-25 津田驹工业株式会社 织机的经纱送经方法和装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1002312A3 (nl) * 1988-07-12 1990-11-27 Picanol Nv Inrichting voor het instellen van de kettingspanning bij een weefmachine.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE768521R (nl) * 1971-02-26 1971-11-03 Weefautomaten Picanol N V Meti Kettingafwinder voor
US3878872A (en) * 1972-09-29 1975-04-22 Sulzer Ag Warp let-off means
US4430870A (en) * 1981-03-20 1984-02-14 Karl Mayer Textilmaschinfabrik Gmbh Control arrangement for a rotatable winding arrangement
US4605044A (en) * 1984-02-24 1986-08-12 Tsudakoma Corp. Takeup motion control device for looms
US4619294A (en) * 1984-01-20 1986-10-28 Tsudakoma Corp. Method of and apparatus for controlling motor-driven let-off and take-up system for looms

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939607C2 (de) * 1979-09-29 1983-10-27 Maschinenfabrik Stromag Gmbh, 4750 Unna Regeleinrichtung für den Antrieb eines Kettablasses einer Webmaschine
CH661754A5 (de) * 1983-10-04 1987-08-14 Saurer Ag Adolph Regeleinrichtung fuer den drehantrieb einer abwickelvorrichtung.
DE3520244A1 (de) * 1984-08-24 1986-03-06 Aktiengesellschaft Adolph Saurer, Arbon Warenabzugseinrichtung an einer webmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE768521R (nl) * 1971-02-26 1971-11-03 Weefautomaten Picanol N V Meti Kettingafwinder voor
US3802467A (en) * 1971-02-26 1974-04-09 Picanol Nv Warp unwinder for weaving looms
US3878872A (en) * 1972-09-29 1975-04-22 Sulzer Ag Warp let-off means
US4430870A (en) * 1981-03-20 1984-02-14 Karl Mayer Textilmaschinfabrik Gmbh Control arrangement for a rotatable winding arrangement
US4619294A (en) * 1984-01-20 1986-10-28 Tsudakoma Corp. Method of and apparatus for controlling motor-driven let-off and take-up system for looms
US4605044A (en) * 1984-02-24 1986-08-12 Tsudakoma Corp. Takeup motion control device for looms

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942908A (en) * 1988-03-29 1990-07-24 Nissan Motor Co., Ltd. Warp transfer control system of loom for filling density change
US5024253A (en) * 1988-12-28 1991-06-18 Kabushiki Kaisha Toyota Chuo Kenkyusho System for controlling warp take up and let off rates
US5029616A (en) * 1989-02-06 1991-07-09 Picanol N.V. Controlling warp tension as a function of weaving pattern
WO1993025743A1 (en) * 1992-06-10 1993-12-23 Älmhults Bruk AB Device in a weaving machine
US5549140A (en) * 1992-06-10 1996-08-27 Texo Ab Back rest arrangement for controlling warp thread tension
DE4325038A1 (de) * 1992-08-18 1994-02-24 Regatron Ag Steinach Regeleinrichtung für den Vorschub von Wickelgut einer Webmaschine
US5386855A (en) * 1992-10-23 1995-02-07 Nuovopignone-Industrie Meccaniche E Fonderia Spa Device for automatically varying the position of the shed vertex in a loom
US5487413A (en) * 1993-06-02 1996-01-30 Kabushiki Kaisha Ishikawa Seisakusho, Ltd. Method for restarting the operation of an air jet loom, after defective weft removal
US5827975A (en) * 1996-02-05 1998-10-27 Sulzer Rueti Ag Method and apparatus for measuring the tension of the warp in a weaving machine
US20020195160A1 (en) * 2001-06-26 2002-12-26 Sulzer Textil Ag Method and apparatus for the regulation of the warp let-off a weaving machine
US20110000576A1 (en) * 2007-09-05 2011-01-06 Toshiba Kikai Kabushiki Kaisha Loom and drive device of loom
US8091589B2 (en) * 2007-09-05 2012-01-10 Toshiba Kikai Kabushiki Kaisha Loom and drive device of loom
EP2199442A4 (de) * 2007-09-05 2013-09-04 Toshiba Machine Co Ltd Webstuhl und antriebsvorrichtung für webstuhl
WO2009128659A3 (ko) * 2008-04-16 2010-01-14 Sho Jinsoo 실공급방법, 경사공급방법, 실공급장치 및 직조방법
KR100976929B1 (ko) 2008-04-16 2010-08-18 소진수 실공급방법, 경사공급방법, 실공급장치 및 직조방법
CN102605518A (zh) * 2011-01-21 2012-07-25 津田驹工业株式会社 织机的经纱送经方法和装置
EP2479326A3 (de) * 2011-01-21 2013-05-22 Tsudakoma Kogyo Kabushiki Kaisha Kettfadenzuführverfahren und Kettfadenzuführvorrichtung in Webstuhl

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EP0257707A2 (de) 1988-03-02
EP0257707A3 (de) 1991-02-27
BE905314A (nl) 1987-02-23

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